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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f5c3fc55e048316790a9deded50ccd9c3d86985ea8e733b12966e871c949c6e' 
  AND token = 'TApCVdTY0nftTccKk1vVfQoP5OaQydbA2BGAzkKayZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

Explain
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE								Impossible WHERE noticed after reading const tables